Joule carried out a series of simple e________ to test his theory.
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A variety of butterflies ________ flying in the jungle, one of which is a very rare one.
A. is B. have been C. are D. has been
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If you happen to __________ my lost novel while you are searching for you book, please let me know at once by telephone.
A. come out B. come up C. come across D. come about
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